<tal:block tal:define="docinfo options/docinfo">
  <span tal:condition="not:exists:docinfo/author">(no bibliographical information)</span>
  <tal:y tal:condition="exists:docinfo/author">
    <b tal:content="docinfo/author"/>,<i tal:content="docinfo/title"/>,<i tal:content="docinfo/year"/>
  </tal:y>
</tal:block>